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Two interstitial-free steel samples were prepared by normal and by cross rolling. The effect of the resulting different deformation textures and microstructures on the subsequent recrystallization behavior was studied by micro-texture analysis. The differences in recrystallization textures of the two differently rolled samples can be attributed to the microstructural differences in the as-deformed state. The orientation distribution of the recrystallized grains forming at the early stages of the recrystallization dominated the final recrystallization textures, pointing to the importance of oriented nucleation in the formation of recrystallization textures of interstitial-free steels.

Abstract:In ferritic stainless steel~FSS!, undesirable surface defects of ridging appear during deep drawing. The formation of these defects is attributed to the inhomogeneous distribution of orientations of individual grains. In the present work, a new electron backscattered diffraction R~a!-value map was introduced, and the dependence of the tensile directions on the formation of ridging in an FSS sheet was discussed using this map. The results showed that large grain colonies in the R~a!-value maps lead to the formation of severe ridging in an FSS sheet.

Asymmetrical rolling was carried out in an interstitial-free steel with different velocities of upper and lower rolls. In order to analyze the effect of change in strain histories on the evolution of textures during asymmetrical cold rolling and subsequent annealing, asymmetrical rolling was performed either reversibly or unidirectionally. The two different asymmetrical rolling routes were accompanied by the formation of different cold rolling textures. The strain state during asymmetrical rolling was determined by the finite element method and verified by macro-texture analysis and texture modeling. Weakening and randomization of textures occurred during recrystallization annealing, which was interpreted by the absence of preferred nucleation in specific orientations.

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